气候变化下的波兰冰川后软质悬崖

IF 2.6 3区 地球科学 Q2 OCEANOGRAPHY
Grzegorz Różyński, Grzegorz Cerkowniak
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引用次数: 0

摘要

本文介绍了在未来海平面上升情况下波兰软悬崖侵蚀的模拟结果。本文对两个地点进行了调查:一个位于沃林岛,另一个位于乌斯特卡镇附近。由于多种原因,悬崖将受到更严重的侵蚀。首先,所采用的海平面上升 0.7 米会直接侵蚀悬崖脚,导致侵蚀加剧,侵蚀率大约是未上升时的两倍。高侵蚀率之所以能够持续,是因为悬崖无法通过向陆地移动来重新配置,即使在较温和的情况下,悬崖也将长期暴露在海浪的侵蚀之下。其次,波罗的海的海浪气候会在靠近海岸线的地方释放大部分能量。第三,较长的风暴事件持续时间会导致 "侵蚀饱和",但这一结果还需要进一步研究,包括在一维模拟中忽略的由当地水深和长岸流引起的沿岸效应。最后,研究发现颗粒度并不那么重要;较细的颗粒对损耗的阻力较小,从而导致更大的侵蚀。研究结果表明,有必要开展大量后续研究:(1)详细绘制悬崖附近的水深图,以正确再现风暴期间沉积物的沿岸再分布,从而更好地估算悬崖的侵蚀情况;(2)详细绘制悬崖岩性图,以正确再现悬崖的沉积物组成,从而更好地估算内置的易侵蚀性;(3)准备二维建模套件,以更好地评估海平面上升对悬崖的侵蚀速率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Soft postglacial cliffs in Poland under climate change

The paper presents the results of the simulations of soft cliff erosion in Poland under future sea level rise. Two locations were investigated: one situated on the Wolin island, and the second near the town of Ustka. The cliffs will be suffering enhanced erosion for a number of reasons. First, the adopted sea level rise of 0.7 m results in a direct attack on cliff foot, leading to enhanced erosion with rates being roughly twice as high as that occurring without the rise. A high rate of erosion can persist because the cliff cannot reconfigure itself by moving landward and will permanently remain exposed to wave attack even under milder regimes. Second, the wave climates in the Baltic Sea release most energy in close shoreline proximity. Third, longer storm event durations can lead to ‘erosion saturation’, but this result requires further investigations, which will include alongshore effects induced by local bathymetry and longshore currents, ignored in 1-D simulations. Finally, the granulometry was found less important; finer grains offer less resistance to depletion, leading to greater erosion. The results demonstrate the need for vast follow-up research: (1) detailed mapping of the bathymetry near cliffs in order to properly reproduce alongshore redistribution of sediment during storms and achieve better estimates of cliff erosion, (2) detailed mapping of cliff lithology in order to properly reproduce their sediment composition and thus achieve better estimates of built-in susceptibility to erosion, (3) preparation of 2-D modeling suites for improved assessment of the rates of erosion of cliffs subjected to sea level rise.

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来源期刊
Oceanologia
Oceanologia 地学-海洋学
CiteScore
5.30
自引率
6.90%
发文量
63
审稿时长
146 days
期刊介绍: Oceanologia is an international journal that publishes results of original research in the field of marine sciences with emphasis on the European seas.
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